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Question
HOW TO CALCULATE THE BREAKING CAPACITY(LIKE 15KA,20KA) OF 
CIRCUTE BREAKER (MCB,MCCB,ACB)
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
it depend upon the value of current flows during short
circuit.
And the short circuit current depends upon the KVA rating of
transformer how supplies that particular load and transformer
percentage impedance.
 
Is This Answer Correct ?    37 Yes 9 No
Shan80
 
Answer
# 2
we must know load of perticular equipment.
For Ex. Our load in MVA is 50 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 50/(1.73x0.440)=65.6 =Approx 65KA.

Our load in MVA is 20 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 20/(1.73x0.440)=26.2 =Approx 25KA.
 
Is This Answer Correct ?    38 Yes 11 No
Jitesh Patel
 
 
 
Answer
# 3
it depends on the short circuit & full load of equipment 
Is This Answer Correct ?    17 Yes 14 No
Ashok
 
Answer
# 4
All above said suggestions are mere copy paste of something from wiki answer.its totally wrong.
Aforesaid calculations are to calculate rated current.
Short circuit analysis is to be done to calculate breaking capacity.
 
Is This Answer Correct ?    1 Yes 0 No
Mohammed Rafi
 
Answer
# 5
we must know load of perticular equipment.
For Ex. Our load in MVA is 50 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 50/(1.73x0.440)=65.6 =Approx 65KA.

Our load in MVA is 20 MVA
Our system voltage(MCB,MCCB,ACB) is 440V.

I(Bre)= 20/(1.73x0.440)=26.2 =Approx 25KA.
 
Is This Answer Correct ?    4 Yes 5 No
Hrusikesh Dehury
 

 
 
 
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